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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8cbf27bdb31f5234f966bd98cf4fd5a80bb4ba124040097d81a4c92f08c30ce' 
  AND token = 'Rgc7KMjU06UEj+lOv5Edz9Dipdi/0aQiN2N4eFcLkq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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