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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385bbfe5a0ef6c1c2a9c98eec51dd5d3b0d5350a0bc5de1d4dd0821247a0644b' 
  AND token = 'BBTJ2bHNdjGVLl/BmXBblEXpq8Fm2NiYaXlkvY6VmQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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