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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd41e894f539b6a0e4563ad2613852938614f84cd3579f4fedd772021f92fee8' 
  AND token = 'vYraUdK6U33rjaOy4/boJ/X5vGKcy0spaJQDIi1Weco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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