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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99cab2b6c7c09e4e50082052f4ef4f113982793e6ea1e72fa516d288cc3b5e23' 
  AND token = 'BZkcg1tOcjalZLbkCuUTrpMa1PO7T+6XhFod7FO/BE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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