SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34b8e87376cd9156009cca0aea5056040f12c7f69a9cc56b9f7d515f54ac67b7' 
  AND token = 'KZwZFBHJ14PCvUg8SFEVfgJHoIQPvTKjkxKJEI2XIfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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