SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3fd2d1dc4e83920d2a306bd67ea86f5e2c47ab0476787a85b2f21757e0cfd9a' 
  AND token = 'qn2Sh4hM8zIUyT9MwWPmHAfPvfGNInO9eHXrB1/Iw+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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