SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2f9ab740415d8cc73f2b17b3b5e9488ba4a0b2f795cbc3b6ae1e99ecc91e2be' 
  AND token = 'H4YgBtKUxHU+U6HPFm+gQZTqLHCjXcJ3d4eruZF/3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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