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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab9ff3780cf12b4521aaca9dddc235cad9877cced0d40bdaad0ff312f601faee' 
  AND token = 'BTK3Vilb/WC8XgMsVbCl/q1bHqKP+vH3wXvis27Zx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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