SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dd0b86e5e7831d7131ca187ca07360d096caf6bd3b998c55c682e9f9e2b4bf9' 
  AND token = '+LMltT6tsSkG4JHC8m0Zhg7OvnPTiKbHRN4lVJHwVUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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