Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c1678a27a0ed316d335743c522e5014948e4559c9e1bb56c620e82940b14e15' 
  AND token = 'vlOwCwZ0TB4X+631DpgdrP7qH9k40+tWZNCdGFIZsKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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