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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '127cd5afa5dfe5785326646c01525298d81d4dfc9ec782f5a0d0096531b52bd8' 
  AND token = 'mJNOnm5iSMHVI2lJmChZWdD85MeRxvEgWHXiplc99iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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