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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d016d1b8c7845b70807ddf5dccb767dd6e32cc0e532cf21b1bf7f3a83b86001' 
  AND token = 'MkRTPDx5k9bJ2qxEagjD7wAhOhNNCtukrqqJg7zfbXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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