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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20bb8045a4ab16e1c5df1b297b0d27e87e5e8a0f7aab8af349d476bbca591c3' 
  AND token = '1QmFd7CVfv6ZFJqzfNeub1AHxzJdwPwLiWiwSouqkDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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