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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcced032a466b01c872ca5e71c2c7e950ac4ceeb28e4b7a18a9e2f92ab67aafe' 
  AND token = 'aRquhMGVeWroER7xQmGKOiwbpMvVPHAcCsut1G2F5Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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