SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1789452c3e6caee48a03f347af1f8b937175f7aee3d97b26bf1d752181ad9578' 
  AND token = 'YBXIuQU87LJJ3ATFGX9DgicMZXG6t+wQ3Uh14381GG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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