SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d6cf6caf47f0bb89bca82ddd4e3ef7b78814ea8917ffd96d85549524666103c' 
  AND token = 'Vghg8RzEN9DQN2WzxcpPVom36+hDdBsKnv5gsH2Ndvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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