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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89dff132b46df0f569f32077d4f6e11b54bd61d1fa967055fb11e603b939a7db' 
  AND token = 'jX1X6pgCti+97GckRQXrTOrt6TTx3/IDj2o1X5f6m0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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