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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ec61cd0acd43a420ecfc3f465ef17e4ed0795cd3193dbf8c13e13779d22a3b' 
  AND token = 'jnvB/g9mbZF8cWk3MvkNhMJye+NVr+vB0Os8aoIwlgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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