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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0deaa9805d06d047abfbd90187aafe980cb075cd63c6adf06873b6c723aaa62' 
  AND token = 'kz8mHiLyybpFlXtRu9T3jwXkJ8/M8IQI6PdIz5JkLng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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