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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3169700e25de5158bba08953181e1fdd7e48b10d06012e0b15988bc15658f0' 
  AND token = '/yHlamzf0TJ+X8ipq+jf+vVAI50lzVb9lGd8ojpY4Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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