SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9e9823b00152bed4b31535a4f9718e4a380657785555ab7e289830176886d2' 
  AND token = 'CwKAD9wnsCA/1MSkmA4ZDkqBI2mB6o/nnW+hUeugSi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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