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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa77fbdb5241f4e3b8506bf6e916d0eb4e3d8fa50d3611b754e936af0cc811a2' 
  AND token = 'Px/qpOdBU62OErWz02LvqdgnZmXdeUqg4H3caX2xoOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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