SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b0ddaeba9badfbf8bab0e751c7e39139a3ab65a5b5fc8c2cff43f06726cb23' 
  AND token = 'ghh3/rGGcrV25/RDTDPJDxEu6z7F5vP3L4w+4sWGmYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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