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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4139d02e75ad36e8166c7086668080565b5dddc8f72e2aedea75b9d76a861f66' 
  AND token = 'uoqukV9v9Ky297Ie143zpQtfRMF8my4z13VA5YV/hWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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