SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e2986f9b6dbcf51b83d09e3c3f36bd6c8cc876d1a53e8b1a3058f9a2c5ce8f' 
  AND token = 'kBOZwr/GOtvY3tJz2546YOJhybp/P7MSLNvJQDKlXwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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