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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '074536009832ea97735e9388d8a4cd63dd8a2ea975f3e9235b027df8141de18e' 
  AND token = 'U8cEce3zsEXNgZudCia800PTxnSdYs4Vpi6eLMev1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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