SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98f482acf684b8d44e4775212384d5716bbe40f6e15d43178c501bfb1e88792e' 
  AND token = 'DbVT/CFo8O+SaFaK2/CzhaPQNeFAkRVDFnvxVfyJwvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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