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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a491afeca83be29a8fc4e923571214cc4cb3f824a01d8764183e4b53e78cd7ed' 
  AND token = 'NUkHhWVlekpOKTH91BtVVxd9q3KZ3MahptsmsJXO2sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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