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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9776633a04e7c92e60664c698c6963c7c9c56b7383f82d019cf022db1b9323b' 
  AND token = 'af5C1TbT/eglK1oXV88ATtJ86tZArdmIlBvGOWNJrxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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