SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97372d201506b11587c4f3593d6b231f7397fca406e451fee1ceadb65d36db31' 
  AND token = 'Vhqk7lumLWrH6kp81YC3ZFmkKbmp86PqoRhmK9Rg/Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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