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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2916b61d30376d8b2eebfb626dc627ac798387273e5870113a4c8fbd05ccdae1' 
  AND token = 'AgH88qjlblMCRayNTnv6JSJ6f3cWIoUVuPadXYCsMm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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