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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '173c22e84e387abf3a46a5530d1f7e9941b5934057ff5c31b226f200f572f4f5' 
  AND token = 'blxKNVNtpCIkE9TwYnuy1C0MQyPB89EIrbFEFcO1qSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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