Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53d73ffedf79d9cc25fabbe3d9f767213da9e76fea65e90afb3bcfebad20b212' 
  AND token = 'dxcbfnog5NIkQKBiKKH8Ckt8sjb3WYUe6yyO74PNRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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