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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '533590f648987a38d8e6acc9167d19ee8cdcf2aebc68dea79b22ccd2707a7c51' 
  AND token = 'qpp7s7DZa/Ond4yqUIE7Ja+VfQSkT2Yigy2IOTxYCgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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