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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05f0cca2a2fbbd7a1b7d1805e06818172abe646923a98318e7308ba615b68700' 
  AND token = 'FmS1KzqJQiN8cg6lOf8fN1UPA66n2lilN/51BtIcSJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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