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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3130bdb01021b9b918bafeb1a45bd4f4a3cb78f89493be684e90cb31654de6c' 
  AND token = 'Ell1wJzlaJwh1JoxSc3IF5WW6jiyEXot1yHvCcUzIiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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