SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d8afff6f9956b3226c8a5857dfdc6648d31e060c6e1c5ee444824a3b00f6a21' 
  AND token = '0sn4yd/C3f0QzFzm19OgOBYpnsqUaJPjvp4JqdGW1Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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