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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158a5bf28bf2a909d93d254b9bd39bcdf4e735c5322b5bb78c0f6cba4c681f99' 
  AND token = 'K8Nb9RUe78n3vBVlVbrzxdO/pOpDP25or4Lc/vj4gSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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