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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65610014dd96c25817f206f63185a9550dbff378472f45671d6ad3146f0886bd' 
  AND token = 'x2+a5WrNb1p//3hbX1sqKMNhbn11oFb/PxjBsgE/3ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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