SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1f9da65c37066b46f2d6284581ff788af27c69a7d5df47229feb6de7adba52e' 
  AND token = 'A5uOllXVIr8X4kLs/Kz/P/y7ZJGidTEQLwTV3iwiWbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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