SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46442e0256683fb31979fd3aa0322c03da5a52090156715ded8aaf9da82eb2c4' 
  AND token = 'S2ahxMsBx7KP6V/j8J76FIdYBs51mtDIvkv8SzKCLRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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