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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcbdb9b16db48e6eb5d4def03fe0ba06772b79117f7556eaa1223a63559b5ee5' 
  AND token = 'cFzSxGzOLpM0UeWi/JQTvTCkcfIfR9QzvNrchYCSIeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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