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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a806176505abc92d9c89c17fe91e3673d6d1a95de60e4854c792f9e3133ae43' 
  AND token = 'QsacjQLaI3YDS23vSml1AI4EJDAvtGKd2ecgRjZlAN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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