SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19f20e69dd938fc8875d85df909fd67d3252eab83f1ff6b9628cda5f40d8911b' 
  AND token = 'YMJ4Bp9KjHjfAyb2A8CSCIy8RULJhnHGvLfYIlKfmVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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