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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '285c5fea30a32718e7d312e47fccf7db5f51a5dc5607d087a7b6edc3509543b6' 
  AND token = 'JDzidWnaNSCjOfcOgiezQNw9i35XnnD8bYWUGui6j3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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