SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dedd382e4ea2216232dc825790d6f1afec75b856ef47e98deb0128b19e8d69aa' 
  AND token = 'X9PvBGoMcuzgsTMeMosnX/AK3jD7m5E3pYGZWyK5Aww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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