SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cfd507d545f6fe8a27f91455f8089298daab2b38dc8033cb1b322520e1e8b4' 
  AND token = 'kBd9bjVM7grPkOVEaaHyGU/Hnb/hpk9YGIzK38OKKT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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