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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b2701bfb2b0b03dd4b62a54e7c2db38e2d999d3e3f96cf63e5aee3944ac34b' 
  AND token = 'pxngVMsh5NfyJ5IPkqPAwwnY3tpQ5efJvkFrKU6nF8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}