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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30d438d3242b61363e8670a50377e804c627a9ebbdeb5dcc057b2771508b20ee' 
  AND token = '/b9i+QgR1CvliLxshuxS614vov9bsWxQvhdDz3ZpNCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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