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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7480ba9beb8e58d61fe17b07e2dbace40b2b70ba80cd98efebf89378215a44e' 
  AND token = '71KuMzThEopB2oSOh8KzhnZP497FgjIgNbKHdyClag8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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