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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '949b48f454138ddbaf0c6dcd3cd88e4210cb48fd9aabd0c5c4a0bb9e3356aa1b' 
  AND token = 'kx0o8UdZFngax4Ij14qphBL/IKWTuOswzbPQiZmiV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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