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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2de9e7e50c7e2ee8ac14532ada1a6d9bf8c1184b39512583481cf3a277fea1ae' 
  AND token = 'punIVGPQ4tJYRGZ9qaaZ08d7BbbJ2c4LCn7yu6CTrto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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