SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc45f1d2a6e00424e3c07721c143e007dc6a002c253ecb26ab83362d31f264b9' 
  AND token = 'D6XQ8w5C18Pk7ooCmzRDtkrJVihKO//9G+A4vc7uJ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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