SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7dc6e03662bf8bc2074822759a0a9d243a2a08c663e87d998c2ad5cb1c2175e' 
  AND token = 'BNqL21VuGkittJ7ZifzbvlrclIH/ji82rgw7NCDHfZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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