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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4de3f7841c54046631eca4073f01dc2e1405ed05447a6b10d921a74b78fc41f0' 
  AND token = 'W9XzRfCveMq+2kagOv96Qn0NonHDEbw6caHwhXynub8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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