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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01dd4153509d22ce7272acfcbae90295a7da53785c9502628e88a6a738f1ee5' 
  AND token = '/HQ4a2cSm2erfrI5OuRcItKXjWammMjd1EQuwAifWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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