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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3999dec5a1701e36576889bc8d31bed6393a590fcad4255d8184c839bb72e84d' 
  AND token = 'Klf5UIeSUgWHtdd9z5BBuG5ez3DYe5TCZCPXL/tLVFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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