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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9604361dbc4302dec9cb11b0f78db2b9eb2c45da4e006f120a087b0faa8d9c2d' 
  AND token = '6CLKGmlivyKD4VhNVzPE88xzfmDgDc6BRxav3luyckQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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