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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31fc11a09841b717a20c2ae1a7b1ed058a1d5d55714b221f24486a21d36bad77' 
  AND token = 'zQnU54ohf1rmTKiLD6xMA7K5KsMVnINrfsM3fMrE+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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