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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc1a9bc890a88b6523eab825ca49d814d3ab7282f389920e037d8240f7ba7d45' 
  AND token = 'tzq4plzvMhtwO/bIbEyh5NaIvDWA/gCBsS5/orhOahE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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