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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7208793d900a354f841342bc68dd24a8ca275f1b9e8fa5f32c39d592bb84f29a' 
  AND token = 'PM4gFWkwVSjgv/8oUh/nFpeTD13ut7u4u7TQplStDQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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